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This Andersen operator reminds me of the 39-206 Andersen Awning Operator Kit. While I am confident this is what you need for your repairs, be sure to double check the dimensions and compare the design to confirm.

This operator uses the 36-086 Andersen Awning Bracket Kit and the 39-286 Casement Window Handle (both sold separately).

Dimensions for 39-206

Alternate view of 39-206

Dimensions for 36-086